Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83c08d686685366…

MALICIOUS

PDF

78.2 KB Created: 2021-07-14 09:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3c62979013cfe4365c1144306b1ab288 SHA-1: 82d5a59149a9a1362e2434ee88e3f95e331a0a49 SHA-256: f83c08d68668536606eb37efeed383d4ec34445e10ebd1f220ddbe682337d1a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of a link farm on disposable hosting and the use of UTM parameters suggest an attempt to manipulate search engine results or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://angkoronetour.com/userfiles/file/71238943887.pdf In PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c574e254f71---kigivonewolararuguwip.pdfIn PDF document text
    • https://oumkua.com/userfiles/file/zudutopa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608382751280d---duzumugorikatavuji.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/b3d4a9f9eee890cbf4c9f1242ccc0a3b/razepikowol.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/5dceed8ec4aa3de7de15f7d90e94cbe0/vijami.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a5b6c269d2b8860bfb1c6e99c46c7a44/bivejilifupudabigema.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/79565711505.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607049447ced0---74862281920.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/6475020557.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1acf5bd1cb159045da88c623aef87e89/51037731881.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608026eca93c8---69345724511.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/10045312531.pdfIn PDF document text
    • http://ashioke.com/images/library/File/xupadifedu.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/ac63jpt1gmctrdj29ue113c3uv/rixetemozodutifemikumar.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/a6422ad4db03582b1ca3ebe95bb2b416/basezarodanofim.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/42299523260.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/6805232413.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/68p2i49gv3dv83r49t6oiunq4i/dabimuwaliliwololila.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/c079e33a2c980f54a3d59088bcda458f/zunatiwuxa.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1bb51753e---93049203881.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/1262963341.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/37490743093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=cockers+angel+rescuePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00A 10440 bytes
SHA-256: 9b9e89021fdd98c1176222ae71374a8522ba0c6bf7b4c1469cea1ca35e1db589
font_01_sfnt_off0000e7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E3 16860 bytes
SHA-256: a1f96992c2f39d9f293ec576eace0dccb71f4cb10d2b7f01bab8b867d166ecca
font_02_sfnt_off000113be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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